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#promethium #synthetic element #radioactive #rare earth element #lanthanide #man-made element #element 61

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#promethium #prometheus #element 61 #titan #radioactive element #pm

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#promethium #element 61 #atomic number 61 #radioactive #prometheus #nuclear energy #pm

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#promethium #element 61 #radioactive element #lanthanide #pm #chemical element #nuclear physics

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#promethium #luminous paint #glow in the dark #atomic battery #beta radiation #radioactivity #pm-147